Steps to Reproduce:

Go to https://en.wikipedia.org/wiki/Conjugate_transpose#Example

Have your browser (tested with Chrome and Edge) at 100% zoom (default).

The displayed matrix shows an incorrect negative sign, different to how it's defined.
Edit: Or rather, the expected negative signs don't show up.

Increasing the zoom (e.g. to 110%) will make it show correctly.

Actual Results:

Expected Results:

How it is defined:

Then we conjugate every entry of the matrix:
:<math>\boldsymbol{A}^\mathrm{H} = \begin{bmatrix} 1 & 1 - i \\ -2 + i & -i \\ 5 & 4+2i\end{bmatrix}</math>

PS: The "Show preview" in the editor also displays this strange behavior when you change the zoom.